Am I able to use Pages to create an auto-numbering receipt?

Am I able to create an auto-numbering receipt in Pages?

I receive cash in person while out of the office so I like to issue a receipt to the giver and instantly send to their email account. I have used Pages to do that in the past but would like to go a step further and have a template outnumber the receipts instead of having to do it manually and have ten or so blank receipts saved ready for use. Is this achievable?